Mouth-piece for speaking-tubes



(llq'ModeL) w W. H. ROSS. MOUTH PIECE 'FOR SPEAKING TUBES.

' No. 440.886. Patented Nov. 18, 1890.

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UNITED STATES PATENT OFFICE VILLIAM ll. ROSS, OF CAMDEN, NElV JERSEY.

MOUTH-PIECE FOR SPEAKING-TUBES.

SPECIFICATION forming part of Letters Patent No. 440,886, dated November 18, 1890.

Application filed July 10, 1890.

T0 at whom it may concern.-

Be it known that 1, WILLIAM H. Ross, a citizen of the United States, residing in the city and county of Camden, in the State of New Jersey, have invented certain new and useful Improvements in Mouth-Pieces for Speaking-Tubes, of which the following is a specification, reference being bad to the accompanying drawing, forming part hereof.

My in vention relates generally to speakingtubes, so called, and specifically to a new and improved construction of mouth-piece for the same provided with a self-adjusting alarm whistle or indicator, and has for its object cheapness and durability of construction, simplicity in operation, and adaptation to either fixed or movable speaking-tubes, the provision of ready means for obtaining access to the interior thereof for cleansing, and, finally, of obviating the employment of springs or the like for adjusting the alarm whistle or indicator into or out of act-ion; and to this end it consists in the novel features of construction, combination, and operation of parts shown in the drawings and hereinafterparticularly described and claimed.

Referring to the drawings, Figure 1 is a front view of a mouth-piece embodying my invention, and showing the alarm-whistle in a position of rest, it being an angular or inclined position, which is also its position when a current of air is applied through the mouth-piece to sound an alarm-whistle located at the opposite extremity of the speaking-tube. Fig. 2 is a side View of the entire mouth-piece. Fig. 3 is a sectional elcvational View of the mouth-piece, taken on the line 00 a", Fig. 1; and Fig. & is a similar sectional elevation View of the mouth-piece, showing the alarm-whistle seated in a vertical position, as when in action to sound an alarm or call, the mouthpieces in Figs. 3 and 4 being represented as connected by a section of speaking-tube shown in dotted lines; and Fig. 5 is a front view of the mouth-piece, taken on the line 1 y, Fig. i.

In the drawings, A is the mouthpiece, and a the mouth-piece per se or flaring lip thereof, the latter being preferably a metal casting of oval or bell-mouth form, having an eX- Serial No. 358,332. (No model.)

teriorly-threaded neck (1', provided with a central orifice or passage-way a B is the alarm-Whistle, of the common and well-known type employed in mouthpieces of speaking-tubes.

C is the chamber, it being preferably a cylindrical shell of metal screw tapped interiorly at one end to receive the screw-threaded neck a, and at its opposite end is provided with an annular flange O, which acts as a wall-plate when the mouth-piece is employed in connection with a fixed speaking-tube. This chamber is further provided with a neck or extension 0*, which is exteriorly screwthreaded for effecting connection with a speaking-tube, and is joined to or cast integral therewith, and has a central passage-way c in open communication with the chamber.

D represents a speaking-tube.

The diameter of the chamber 0 is of size slightly in excess of the whistle B, and the latter is of size slightly in excess of the diameter of the passage-ways a and c, and is freely mounted or loosely placed within said chamber. \Vhen the whistle is at rest or out of action within the chamber, it takes the angular or inclined position relatively to the chamber, as shown in Figs. 1 and 3, a portion of the passage-way 0 being exposed. This also is its self-adjusted position when a current of air is directed from the front of its mouthpiece, and permits the free passing of said air-current t0 and through the speaking-tube to sound an alarm or call by means of a similar alarm-whistle located at the opposite end of the. attached tube. The relative size of the whistle and the interior length of the chamber are such as to permit of the whistle assuming a prescribed angular or inclined position within the chamber sufficient only to partially uncover the passage-way c, to allow of the passing of an applied air-current for the purpose hereinbefore recited. lVhen a current of air is oppositely directed through the tube, it lifts the whistle out of its angular or inclined position and seats it in a vertical position to the front of the chamber next the passageway a and closes said passage-way, and, as will be understood, the air-current then finds its outlet through the holeb in the whistle B, simultaneously sounding an alarm or call, all as indicated by the arrows in Figs. 3 and 4. The Whistle resumes its inclined position when the applied air force has found its escape from the mouth-piece.

The mouth-piece per se, a, being removable, easy insertion or removal of the whistle is permitted, and also provides means of access to the interior of the chamber for cleansing the parts.

I do not wish to be understood as confining my invention to the exact construction of parts as shown and described, as it will be apparent that details of construction maybe adopted without departing from the spirit of my invention strictly as such. Thus, for instance, the employment of the flange 0 on the chamber 0 is only necessary as a matter of finish or as a wall-plate when the mouthpiece A is attached to the end of a rigid or fixed speaking-tube. It can well be dispensed with when the mouth-piece is applied to a flexible or movable tube. Again, instead of combining the mouth-piece a with the chamber C and the neck (1* of the chamber C with a speaking-tube by screw-thread joints, as shown and described, the parts can Well be combined by adapting them to telescope or slide one within the other in a manner to make a snugfrictional and air-tightjoint, the

essence of my invention residing, as stated, in constructing a mouth-piece for a speakingtube provided with an alarm-whistle freely mounted within a chamber-and self-adjusting upon the application of a current of air in the manner described.

Having thus described my invention, I claim 1. A mouth-piece for speaking-tubes, consisting of a suitable chamber provided with a mouth-piece proper at one end and at its other end with suitable means forconnecting with a speaking-tube, and a whistle located in said chamber and free of any attachment thereto, the whole constructed,arranged,and adapted to operate substantially as and for the purposes set forth.

2. In combination with a speaking-tube, a mouth-piece consisting of a suitable chamber provided with a mouth-piece proper, and a whistle located in said chamber free of any attachment thereto and self-adjusting, as described, and for the purposes set forth.

In testimony whereof I have hereunto signed my name this 6th day of March A. D. 1800.

'M. II. ROSS.

In presence of W. J. Ross, \V. ALEX. RoBINsoN. 

